If you did this you might not know about the Proxmox Helper Scripts: https://tteck.github.io/Proxmox/
It has a bunch of scripts to help setup and maintain containers. This use case should be covered by the "Proxmox VE LXC Updater" in "Proxmox VE tools" group.
I did know about this page, I used some of those scripts to setup some containers, however I did not know about this updater one and it does look pretty cool! And way smarter than mine ahah
Proxmox VE is a complete, open-source server management platform for enterprise virtualization. It tightly integrates the KVM hypervisor and Linux Containers (LXC), software-defined storage and networking functionality, on a single platform. With the integrated web-based user interface you can manage VMs and containers, high availability for clusters, or the integrated disaster recovery tools with ease.